"SOS" or "SOS Only" on an iPhone means that your device is not connected to your usual cellular network, but it can still make emergency calls using other available carrier networks. This status appears in the top-right corner of the screen where the signal bars usually show

What "SOS Only" Means:

• You cannot make regular calls, send texts, or use mobile data.
• You can only make emergency calls to numbers like 911 (US), 112 (Europe), 999 (UK), or other local emergency numbers depending on your location.
• This mode ensures you can always reach emergency services even if your carrier network is unavailable.
• It can occur if you are out of range of your carrier but within range of a different carrier's network that allows emergency calls

Common Reasons for "SOS Only":

• Poor or no coverage from your carrier (e.g., in remote areas, underground, or inside buildings with thick walls).
• Carrier network outages.
• SIM card issues (damaged, inactive, or not properly inserted).
• Traveling internationally without proper roaming enabled

How to Fix "SOS Only":

• Move to an area with better network coverage.
• Toggle Airplane Mode on and off to reset network connections.
• Restart your iPhone.
• Check for carrier settings updates or enable Wi-Fi calling if supported.
• Consider using dual-SIM or switching carriers if the issue persists frequently

In summary, "SOS Only" is a safety feature that restricts your iPhone to emergency calls only when normal cellular service is unavailable, ensuring you can still reach help when needed